1. Business etiquette and communication methods: American businessmen tend to adopt direct, open and confident communication methods, while Japanese businessmen tend to adopt indirect, modest and witty communication methods. This difference may lead to misunderstanding and unnecessary disputes.

2. Business negotiation style: American businessmen usually pay attention to efficiency and results, and prefer to make quick decisions and express opinions directly. Japanese businessmen, on the other hand, pay more attention to the process and relationship, and usually make a decision after a long period of consultation and negotiation. When expressing their opinions, they will be more subtle and tactful, which requires in-depth understanding.

3. Business culture values: American businessmen pay attention to individualism, competition and the pursuit of profit maximization, while Japanese businessmen pay more attention to collectivism, cooperation and maintaining corporate reputation, and pay attention to long-term cooperation and good social image. Due to these cultural differences, there may be various obstacles and conflicts in the business cooperation between the United States and Japan. American businessmen didn't get satisfactory results, probably because they didn't fully understand Japanese business culture and were not prepared for cross-cultural communication. At the same time, due to the great cultural differences between the two sides, both sides need to learn and adapt, and cooperate and coordinate in communication, decision-making and trust.