I submit my paper to a journal but they not publish yet. I submit another paper to another journal still not published. Is my paper bad quality so the journals not publish?

Apparently, there is no relation between the quality of the paper and the peer review time. Generally the journals take a long time to publish a paper due to the vigorous peer review process that is time consuming, irrespective of the quality. It is just purely coincidence that the peer review time for both your papers has been longer than usual. Usually a peer review process takes a time between a few weeks to 4-5 months. The possible reasons as to why your papers are taking longer to publish could be many. Possibly, the topics of your papers were very niche, and hence finding subject-specific reviewers was difficult for the journal editorial board. Another possibility could be that the writing style of the manuscript may not be up to the mark, thereby making the reviewers take more time to review. However, you can wait for the reviewer comments before submitting your manuscript to another journal or withdrawing the manuscript. Once you receive the peer review comments, you will have more clarity on whether there is any specific issue with your writing style.

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