I'm trying to use the chronosys package and unfortunately the events are overlaping each other.
Here is a minimal example :
\documentclass[article]
\usepackage{chronosys}
\begin{document}
\startchronology
\chronoevent{1500}{Texte A}
\chronoevent{1525}{Texte B}
\stopchronology
\end{document}
And here is the result :

Can anyone help me on this?

chronosysis forcing your "year-line" to be linear, that could be a problem with closely spaced dates. The alternate approach cited here allows you to tailor the inter-year separations to suit. The appearance could be made to look more like what you have in your question, as well. – Steven B. Segletes Feb 20 '14 at 14:13