Abstract: Monochamus alternatus Hope usually has one generation every year under natural conditions in the area of Dazhou City, and the larval stage consists of five instar. A few (0.95%) newly discovered species have one generation every two years (which has not been reported in China). The wintering period is from early November to late March of the next year, the larval stage is 292-355d, the pupal stage is from early April to early April, and the pupal stage is from 11 to 28d. The emergence of the pupal stage is from late April to late April. The peak of emergence is from late May to late June. Mainly concentrated in the weak pine dry high transverse groove to spawn, 1 ~ 8 m interval 5 cm below the rare groove, generally 1 slot to spawn 1 grain, two in individual, newly discovered a few upper bark smooth without groove, the egg laying pipe can be directly inserted into the subcutaneous cambium spawn in the country (this rare reports), die on the number of groove rate of about 24.8%; The egg-laying period is 8~14 days, and the egg-laying period is from mid-May to mid-September. The number of female adult egg-laying grooving ranges from 109 to 201, and the number of egg-laying varies from 50 to 150. The larvae hatched from the eggs have no pupation and emergence in the current year. The larvae validity was about 79%. The adult life span was 34-58 days for females and 35-66 days for males. The ratio of female to male was 1∶0.89. The larvae of 1 pouch type wintered in xylem burrow every 2 years, and experienced 2 overwintering periods (upper overwintering period for young larva and lower overwintering period for older larva). They pupated in early May, and emerged into adults from mid-May to early June. Prevention and control measures to perfect timing: artificial deforestation destroyed measures in the middle of that year in early November to April the following year, physical prevention and control of hanging set traps for adult eclosion early in late April, biological control spraying high spore hundred anisopliae should be brought forward to pupal stage of early April, chemical prevention and control of thiazole phosphorus microcapsules powder for feather peak in late may to mid-june.