In this paper, we consider the problem of the homogeneity of variance test in Randomized Complete Block Design (RCBD). Schaalje and Despain [20] reviewed the variance homogeneity test for RCBD with fixed as well as random block effects and performed simulation studies of RCBD with random block effects. The improvement from these variance homogeneity tests can be divided into three categories (i) to adjust fixed block effects and degrees of freedom in F test, (ii) to improve the power of variance homogeneity tests, and (iii) to develop a robust test that can be applied to non-normal distributions. Surprisingly, very little attention has been paid to testing the variance homogeneity among treatment groups when the number of treatment groups is large and the number of blocks is relatively small. Our simulation results indicate that even under normality assumption, all previously developed tests either suffer from severe inflation of Type I error rate or lose statistical power to detect heterogeneity of variances when the number of treatment groups is larger than the number of blocks.