In order to solve the cooling problems of high power laser

a new method is put forward

on the basis of analyzing the advantages and disadvantages of existing cooling methods.By using the finite volume method

the steady-state thermal performance of heatsink are investigated by taking account of the heat pipe number

the heat pipe height

the heat pipe diameter and clearance ratios.A physical model of the heatsink is built

then the numerical simulation of the model is carried out.The results show that

when the Reynolds number is 32300

the average Nusselt number tends to 497 with the increasing number of the heat pipe from 36 to 64.When the heat pipe height increases from 25 mm to 35 mm

the average Nusselt number decreases by 7.86%

and the friction coefficient reduces by 10.7%.When the heat pipe diameter increases from 6mm to 10 mm

the average Nusselt number grows by 77.72% while the friction coefficient drops by890.53%.When the clearance radios increases from 0to 0.5

the average Nusselt number decreases by40%

at the same time

the friction coefficient decreases by 44%.The research results are helpful for optimizing design of the heat pipe pin-fin heatsink.