To investigate the effect of EDTA on the in vitro development of parthenogenetic eggs of ICR strain mice, those were cultured in 35mm culture dishes containing NaHCO3-BMOC-3 medium supplemented with 10, 50, 100, or 500$mu$M of EDTA at 37$^{circ}C$ for 96hrs. under the atmosphere of 5% CO2 and 95% air. EDTA supplementation of 10, 50, or 100$mu$M to medium significantly(P<0.01) increase morula and blastocyst formation rate compared with controls in haploid(19.8, 25.9, 39.0% vs. 0.0%). And compared with 10, or 50$mu$M of EDTA supplementation, significantly(P<0.01) higher morula and blastocyst formation rate resulted from EDTA supplementatin of 100$mu$M. Both the nuclear number and diameter of blastocysts developed from parthenogenetic eggs were not affected by the morphological types when they were cultured, or the supplementary concentrations of EDTA. The nuclear number of blastocysts developed from haploid, diploid, and immediately cleavaged eggs was 44.8$pm$1.2, 45.2$pm$1.5, and 45.4$pm$1.8, respectively. And the diameter of those eggs ranged 104.4$pm$1.8, 104.3$pm$1.2, and 103.8 1.3$mu$m, respectively.