concentrated in the environmental impact assessment 
step. 
The main causes of these problems may include: 
(a)  The  process  of  the  project  is  cumbersome, 
requiring  a  complex  approval process  for  each  step 
and each step should be executed in strictly sequential 
order; 
(b)  The  lack  of  unified  standards  for 
environmental  impact  assessment  of  marine 
environmental restoration projects in China makes it 
difficult to pass the environmental impact assessment 
step. 
In  view  of  the  existing  problems  in  marine 
environmental restoration of the Bohai Sea, this paper 
suggests that, on the one hand, the process of marine 
environmental  restoration  project  should  be 
simplified, such as reducing the number of approval 
steps  or  taking  place  simultaneously.  On  the  other 
hand, the environmental impact assessment standards 
for marine environmental restoration projects should 
be promulgated as soon as possible. 
6  CONCLUSIONS 
Dealing  with  the  deficiencies  in  the  academic 
research on marine environmental management of the 
Bohai  sea,  with  a  special  focus  on  the  marine 
environmental management policy content, this paper 
tried  to  exploring  the  existing  problems  in  marine 
environmental restoration of the Bohai sea based on 
the  detail  investigation of the objective  and  content 
changes  of  marine  environmental  management  in 
Bohai sea since 1982. Future marine environmental 
management direction of the Bohai sea has also been 
predicted with exploratory solutions proposed in this 
paper. 
From  1982  to  2020,  great  changes  have  taken 
place in the marine environmental management of the 
Bohai Sea. The management objective has changed 
from  targeted  pollution  control  to  comprehensive 
ecological management, and the management content 
has  increased  the  marine  environmental  restoration 
on the basis  of reducing the discharge of pollutants 
into  the  sea.  In  addition,  the  marine  environmental 
restoration  schemes  are  becoming  more  and  more 
comprehensive.  From  the  simple  vegetation 
restoration,  various  schemes  such  as  coastal 
restoration, dredging, and offshore structure removal 
have been gradually added. It is expected that marine 
environmental management of the Bohai Sea in the 
future will continue to take into account the reduction 
of  the  pollutants  into  the  sea and  the  restoration  of 
marine  ecological  environment.  The  marine 
environmental  restoration  project  will  further 
simplify  the  process  and  promulgate  the 
environmental impact assessment standards as soon 
as possible, which are currently the key issues to be 
addressed in China. Study in the policy evolution of 
environmental management scheme in China can also 
provide  importance  hints  and  directions  for  other 
developing countries, which are now suffering from 
the  environmental  problems  caused  by  the  reginal 
economic developments. 
ACKNOWLEDGEMENTS 
The authors would like to thank the financial supports 
from  National  Key  R&D  Program  of  China 
(2019YFC1407705  and  2020YFE0201200), 
Fundamental  Research  Funds  for  the  Central 
Universities  (DUT20RC  (3)010)  and  Research 
Center for Port Development at Dalian University of 
Technology. 
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