Characteristic of size (shell diameter and shell high) of Monacha cartusiana snail were studied during the growing season in the period from October 2009 up to may 2010 under laboratory conditions the results obtained can be summarized as the following: a) Shell diameter The highest number was 68 individuals with the shell diameter of 12- 12.18 mm during November 2009. While, the lowest number was 9 individuals. During activity season 2009/2010 the total numbers of shell diameter with measurement of 11- 11.18mm were 247 individuals followed by 246 and 218 individuals measurement of 12-12.18 and 9-9.18mm, respectively. b) shell high The highest total of number for shell high with measurement of 6.14- 6.18 mm. were 546 individuals followed by 318 individual of measurement 6.1-6.12mm. On the other hand, the lowest total of number for shell high with measurement of 2.20- 3.00 mm. were 22 individuals. The highest number was 130 individuals with the shell high of 6.14-6.18mm during November 2009. While, the lowest number was only one individual with the shell high of 4.12-4.18mm. Also, the results revealed that the individuals with shell diameter of measurement 9-9.18, 10-10.18, 12-12.18 and 13-13.18mm were highly during April 2010, December and November 2009, respectively. Regarding shell high in all studied months the individuals were appeared with different levels in the numbers.