The genetic parameters for fleece traits of Inner Mongolian Cashmere Goat at different staple length were investigated. Data was collected with 4178 repeat records from 2008 to 2011 in a breeding farm of Inner Mongolia White Cashmere Goats (IMCGs). IMCGs were divided into three types based on staple length which named short-staple length (SSL), intermediate-staple length (ISL) and long-staple length (LSL). The genetic parameters of fiber length (FL) and fiber diameter (FD) were estimated under the repeatability and multivariate animal model with the AIREML method using the WOMBAT software in the three types. The heritabilities were 0.21 +/- 0.04, 0.30 +/- 0.03 and 0.39 +/- 0.04 for FL of SSL, ISL and LSL, respectively, which belong to moderate heritability. Heritabilities for FD were moderate in SSL, ISL and LSL (0.23 +/- 0.03, 0.25 +/- 0.0.02 and 0.29 +/- 0.04). The genetic correlation between FL and FD were negative in the SSL, ISL and LSL (-0.23 +/- 0.01,-0.23 +/- 0.03 and -0.48 +/- 0.01). Phenotypic and genetic correlations of FL were higher than 0.48 and 0.93 in three types. And the phenotypic and genetic correlations for FD were higher than 0.60 and 0.95 in three types. The results show that the phenotypic selection for staple length are possible to increase the FL and decrease FD and genetic progress can be achieved quickly in IMCGs by selection the LSL as the breeding stock.