As a developing country, independent innovation is not self-innovation, more non-closed innovation, and cannot exclude technology introduction, but technological innovation capabilities cannot be directly obtained through introduction, and key technologies cannot be bought. Japan and South Korea introduce technology and digest and absorb. The ratio of expenses is 1:5 and 1:8 respectively, while the ratio in our country is 1:0.15.
 The main problem of my country's technology introduction is insufficient digestion, absorption and re-innovation of imported technologies.