Abstract: In view of the aluminum alloy is good process performance,based on the research,on the basis of A356 aluminum alloy solid forming for air processing for the A356 aluminum alloy shell of the robot design, adding titanium can effectively reduce the content of iron,to effectively control the number of iron-rich phase,acicular beta iron-rich phase in the composites gradually transformed into Chinese characters shape alpha iron-rich phase,at the same time,the size of the iron-rich phase decreased significantly; Tensile strength,yield strength increased significantly,plastic also increased.The results show that,with the increase of titanium element,the grain size of the alloy is obviously refined,and when it exceeds a certain value,the refining effect is obviously decreased. In the semi-solid isothermal treatment,the width and length of the i- ron-rich phase increase first and then decrease with the increase of temperature.The grain size also decrea- ses first and then increases with the increase of temperature. With the extension of isothermal time,the length and width of the iron-rich phase increase.The spheroidization of the unmelted primary phase showed an obvious trend when the isothermal time was prolonged or the refiner was added.