The aim of this paper is to understand the effect of the magnetic fields on disk accretion, we used protoplanetary disk formation simulation data to observe the relationship between the magnetic field and disk rotation speed. We use yt which is a python package to visualize simulated data. Through the simulated data, we find out the filamentary structure of the accretion flow. Here, we use three angles constituted by gas velocity, gas magnetic field, and filamentary structure to examine their correlations.