The objective of this study was to evaluate the influence of crossing method, birth year, age of dam, season and sex with regard to body weight, withers height, body length and chest girth of Korean native, Brahman, Santa Gertrudis, single cross bred and backcrossbred cattle mated with Brahman and Santa Gertrudis sire to Korean natives at birth, 3, 6, 12, 18, 24 and 36 month of age by least square method of Harvey. Mating method was significant (p=0.01) for all charactor at all month of age. Effect of birth year was more influence from birth to 6 month of age than at any age and effect of season was not significance for all traits. Age of dam was not significant effect except withers height and chest girth of age, body length at 18 month of age, and it tend to be curvelinear effect reached maximum at 6 or 7 years old, but it was disappeare from after 18 month of age. Sex was significant for all traits at all month of age except body weight at 12 and 36, withers height at 18 and chest girth at 3, 12, and 36 month of age.