The　phase　field　model　is　established　for　the　eutectic　growth　system　in　this　paper,　and　the　finite　difference　method　is　used　to　solve　the　model.　The　evolution　of　tilted　eutectic　interface　morphology　under　isothermal　solidification　and　directional　solidification　conditions,　respectively,　was　investigated.　The　effects　of　solid-solid　interface　anisotropy,　solid-liquid　interface　anisotropy,　eutectic　spacing　and　pulling　speed　on　the　evolution　of　the　tilted　eutectic　structure　were　simulated　to　reveal　the　growth　mechanism　of　the　tilted　eutectic　structure.　It　is　found　that　under　isotropic　and　directional　solidification　conditions,　eutectic　growth　is　influenced　by　both　of　the　direction　of　heat　flow　and　the　solid-liquid　interface　anisotropy.　When　the　solid-solid　interface　anisotropy　is　small,　the　direction　of　heat　flow　dominates　the　growth　direction　of　eutectic　structure,　and　as　the　solid-solid　interface　anisotropy　increases,　the　growth　direction　of　eutectic　structure　starts　to　tilt.　Two　kinds　of　instability　phenomena,　bifurcation　or　merger　and　fault　line,　are　also　found　in　the　eutectic　growth.　©　2021　The　Author(s).