The J-PARC muon g-2/EDM experiment aims to measure the muon magnetic moment anomaly $a_�� = (g -2 ) / 2 ~ $. The target sensitivity for $a_��$ is a statistical uncertainty of $450 \times 10^{-9}$, and $a_��$ can be extracted by measuring the spin precession of muons ($��_a$). The $��_a$ can be extracted from the distribution of muon decay time, and the time is measured by reconstructing tracks of positrons which are decayed from the muons. To extract $��_a$ precisely, the systematic effects on $��_a$ should be controlled under the aforementioned sensitivity. To study systematic effects, we develop a compact simulation package, and using our developed package, we study several systematic effects and discuss results. We discuss the package details and studies of systematic effects on $��_a$ based on our package.