The worldwide total production of shrimp industry reached one million tons in 2002, and before that, the main cultivating species was Penaeus monodon. In recent, there were disease outbreaks in farmed P. monodon, and therefore, Litopenaeus vannamei became the main species in shrimp cultivation. P. monodon is the local shrimp species and its production was almost 95,000 tons in 1987. The huge amount of P. monodon died because of the disease outbreak in 1988, and the shrimp industry collapsed following the failure in disease control, environment management and cultivating skills, hence, L. vannamei had been substituted for P. monodon. To conserve the local species and to promote the P. monodon industry, the main concern is to solve the problems of the viral diseases which cause great damage to cultivating P. monodon firstly. White spot syndrome virus (WSSV) caused the epidemic disease in Zhangpu County, Fujian Province, China in 1992, and furthermore, becauseof the rapid extension, it became one of the most dangerous pathogens in the world. Although the researches and detecting skills related to the WSSV are well established, yet the leak of cultivating epidemic controls resulted from the low detection ratio in post larvae is the crux right now. There fore, to clarify the doubtful problems of detection by investigating the parameters of WSSV infection to post larvae in the initial stage is the main expectation.