In this paper

the relationships between active chain concentration ([

P

·]) and conversion (

x

)

conversion and polymerization time (

t

) with or without the quasi-stable state hypothesis were discussed. Under the quasi-stable state

x

~

t

curve

not [

P

·]~

x

curve

is influenced by the operation mode. With the polymerization mechanism of initiator trigger and coupling or disproportionation termination

higher conversion could be gained in batch reactor than that in continuous stirred tank reactor under the same polymerization time. Without the quasi-stable state hypothesis

both [

P

·]~

x

curve and

x

~

t

curve are influenced by the operation mode. With the polymerization mechanism of initiator trigger and no termination

higher conversion could be gained in continuous stirred tank reactor than that in batch reactor under the same polymerization time. We hope that the results could contribute to the teaching of lectures and studying of undergraduates.