Recent studies indicate a more than 4 sigma deviation from the LCDM model through a model-independent parametrization of a Hubble Diagram of supernovae, quasar and gamma ray burst. In this talk, after introducing the basis of the cosmography, I will look into this tension deeply and show our reanalysis results. Some issues will be discussed. In addition, other model-independent method such as Gaussian process and its applications on gravitational waves cosmology will also be mentioned.