High-performance blackbody radiation source is the key equipment for high precision reproduction of radiation temperature.Integrated emissivity of blackbody cavity numerically simulated by finite volume method（FVM）has a good agreement with the result computed by Monte-Carlo method（MCM）.Moreover

the FVM can predict the trend of integrated emissivity more accurately than MCM.Based on design of experiment with response surface method

key factors and their interactions of a cylindro-conical cavity

such as length-to-diameter ratio L/D

aperture diameter to cylinder diameter ratio D

a

/D

co

ne angle θ

and relative temperature difference on the cavity wall ΔT

are analyzed for integrated emissivity ε

e

and its distribution uniformity on aperture η.The results show that ΔT is the most significant factor

then are D

a

/D and L/D（p

<

0.05）

and θ has less influence on ε

e

.The η decreases linearly with the increase of ε

e

means more uniform distribution of ε

e

on aperture.Research results provide references for the manufacture and study on high-performance blackbody radiation source.