According to Taylor's theory, five shears system in fcc metal must be chosen so that two shears occur on each of two planes, one on the third and none on the fourth. From several combinations of shears system, present simulation chose the most suitable shear system based on the minimum shear magnitude theory to fulfill strain components. Firstly the present simulation under relaxation with shear strain NR(components between normal direction and rolling direction) shows that copper orientation {112}< 111 > is remarkably reproduced during rolling only in Taylor's five shears model in stead of Taylor orientation {4411}< 11118 > in previous report under full constraints. The copper orientation has a maximum value at 0.6 (ratio to normal strain) of NR. The maximum value changes according to selection of none shear plane in Taylor's five shears model to such as 49%:(111), 43%:(1 (1) over bar1) & ((1) over bar 11) and 18%:((11) over bar1). On the other hand, brass orientation decreased with NR and disappeared more than 0.3 of NR in the model. Secondly the simulation under relaxation with complex shears of both NR and NT(components between normal direction and transverse direction) shows that copper orientation decreased with NT and disappeared more than 0.3 of NT under constant NR of 0.6 during rolling while brass orientation {110}< 112 > increased with NT and has a maximum at around 0.3 of NT in Taylor's five shears model where the maximum brass orientation changes according to selection of none shear plane to 7%:(111),22%:(1 (1) over bar1), 10%:((11) over bar1) and 14%:((1) over bar 11). This increase of brass orientation with. NT is shown also in six (i.e. two 'one shear' planes and two 'two shear' planes) or eight ( i.e. four 'two shear' planes) shears model.