 In this paper, the effects of nonlinear thermal radiation and chemical reaction on MHD-casin natto fluid flow over a porous stretching slash shrinking surface were studied. A similarity transformation was used to convert the governing coupled partial differential equations into ordinary differential equations, which were then solved using the successive linearization method, SLM, and Chebouchev spectral collocation method. The velocity, temperature, concentration, and entropy profiles were analyzed and compared with previous studies. Additionally, the local Nesselt number and Sherwood number were calculated and compared with the existing literature. This article was authored by Jiaqing, Muhammad Mubashir Bhatti, Moonover Aliyah Boss, and others.